I can tell when, in my writing, I’ve switched from essentially left-brain work to full-on right-brain storytelling mode. My spelling goes all to hell. My left brain is a great speller, never confuses no with know or to with too or two, knows the rules of grammar and punctuation. My right brain, however, knows how to fall into the story and live it, and doesn’t worry overmuch about getting the damned thing down on paper in left-brain-satisfactory fashion.
I’m ass-deep in right brain typos today, and my left brain is exercising its powers of profanity getting the mess straightened out. Nearly to the halfway point, though. Have to be to at least page 620 when I knock off for the day. LONG way yet to go.